Also,how t to add a new parameter of the project let's call it "NTL.a" ?

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What do you mean with "parameter"? If it is a library you can drag&drop the .a file on your project window or click Action>Add>Existing frameworks then if your lib isn't in the list click "Add Other..." and select it.

If you mean a flag for the compiler or something similar you can edit the configuration of your project by clicking onto the project name with the small blue icon in the left column (Groups & Files), then click the Info button and select the Build tab.

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